Dateline with Lester Holt
THURS. 10P/9C, FRI. 9P/8C AND SUN. 7P/6C

PREVIEW: Internal Affairs

A beautiful, popular graduate student is shot dead outside her apartment in Durham, North Carolina. Who would want her dead - and why? Two hours after the murder, detectives get a lead from a 911 caller and discover the student's fiancé may hold the key to solving the case. Josh Mankiewicz reports.